<template>
  <h2>当前求和为：{{ sum }}</h2>
  <button @click="sum++">点我</button>
  <hr>
  <h2>当前信息为：{{ msg }}</h2>
  <button @click="msg+='!'">修改信息</button>
  <hr>
  <h2>姓名：{{ person.name }}</h2>
  <h2>姓名：{{ person.age }}</h2>
  <h2>薪资：{{ person.job.j1.salary }}</h2>
  <button @click="person.name+='!'">修改姓名</button>
  <button @click="person.age+=1">修改年龄</button>
  <button @click="person.job.j1.salary++">涨薪</button>
</template>

<script>
import {ref, reactive, watch, watchEffect} from "vue";

export default {
  name: "Demo",
  setup() {
    let sum = ref(0);
    let msg = ref('你好啊');
    let person = reactive({
      name: '张三',
      age: 18,
      job: {
        j1: {
          salary: 20
        }
      }
    });
    // 1. 监视ref定义的一个响应式数据
    watch(sum, (newVal, oldVal) => {
      console.log('sum修改了', newVal, oldVal);
    }, {immediate: true});

    watchEffect(() => {
      const x1 = sum.value;
      const x2 = person.job.j1.salary;
      console.log('watchEffect所指定的回调执行了');
    });
    return {
      sum,
      msg,
      person
    };
  }
}
</script>

<style scoped>

</style>